Method of drying double-faced corrugated board



R. E. JONES METHOD OF DRYING DOUBLE FACED CORRUGATED BOARD June 10 1924.,

2 Shams-Shea; 1

Filed May 2 192 June 10, 1924, 1,497,446

R. E. JONES METHOD OF DRYING DOUBLE FACED CORRUGATED BOARD Filed y 2. 1921 2 S-hets-Sheet. 2

awveutoz 04, W attozmmg the corrugated board.

Patented June 10, 1924.

uuirso STATES RICHARD E. JONES, OF BROOK LYN, NEW YORK. ASSIGNOR TO ROBERT GAIR COIMITIPANY,

PATENT OFFICE.

OF BROOKLYN, NEW YORK. A CORPORATION OF NEW YORK.

METHOD OF DRYING DOUBLE-FACED CORRUGATED BOARD.

Application filed May 2,

To all whom it may concern Be it known that I, RICHARD E. JONES, a citizen of the United States, and a resident of the'borough of Brooklyn, in the city of New York, county of Kings, and State of New York, have invented a certain new and useful Method of Drying Double- Faced Corrugated Board, of which the following is a specification.

This invention relates to the manufacture of so-called double-faced corrugated board and has more particularly reference to the method of uniting the corrugated straw board with jute-liners in a continuous process machine.

In the art of making double-faced corrugated board, as it is practiced at-the present time, the board of straw or other material, is passed through corrugating rolls, then one liner of jute, or other material, is applied to one side of the corrugated material by means of an adhesive and the resulting product passed over a heating surface; a second liner of jute or other material, is then pasted on the other side of the corrugated material and the resultant product is then passed over a heating surface. The

temperature of the heating surface may be as high as two hundred and thirty degrees (Fahrenheit) and the liner that is immediately adjacent to the surface will receive the full benefit of this heat. The other liner which is exposed to the air will be subjected to the temperature of the room in which the machine is placed which will be, say, eighty-five degrees. The result is that the air within the corrugations and between the liners will be heated to a high degree and the pressure thus created will destroy the adhesive bond between the top liner and It has been attempted, but without success, to introduce cool air into the corrugations. When this is done the adhesive will not set properly and the constituent elements of the doublefaoed board will be but imperfectly united, condensation will take place and the finished board will be a limp mass instead of a rigid structure. Attempts have also been made to prolong the time period of d ing by lengthening the machine but these ave likewise been unsuccessful. Although it is mechanically possible with existing machinery to corrugate the straw board and paste the liners thereon at a relatively high 1921. Serial No. 466,284.

rate of speed. the ditliculties in respect to the drying of the product necessitates a slowing down of the machine and it is generally the custom to run such machines at the rate of about ninety feet per minute, and it is'also the custom, after the board is cut into lengths, to stack the sheets to allow them to dry.

The main object and feature of this invention is to overcome these difficulties to the end that the product shall be without blemishes resulting from lack of proper adhesion between the constituent elements thereof; and also to permit the machine to be run at a more rapid rate of speed than heretofore.

In the accompanying drawings, the invention is clothed in one concretev and preferred form in which Figure 1 is a diagrammatic view of a machine for carrying out the process of the invention: and

Figure 2 is a vertical sectional view on the line 2-2 of Figure 1.

1 indicates the source of supply of straw board that is led between the corrugating rollers 2 after which adhesive is applied by a fountain 3 and a liner 4 is pasted on one side of the corrugated material. The product thus obtained is led over the heating surface 5 which may be a chest containing steam pipes 6. The material then passes overa fountain 7 that applies adhesive to the other side of the material after which a second liner 8, coming from roll 9, is'united with the corrugated material thus producing the double-face board 10. This material is then led over a heating surface 11, which the double-faced board. Surroun ing this surface 11 is a chamber or housing 13. Suitable means are provided for creating a current of heated air and for subjecting liner 4 to an air pressure preferably greater than that established within the corru tions. T 0 that end, an intake 14 is arrange inthe lower part of the chamber and, by reason of partition 15, the air is carried beneath heated surface 11 and up around the same to the top thereof. 16 is a suction fan for setting up a current of air through the chamber. The current of air thus created is preheated in passing beneath surface 11 and, when it arrives at the upper side of said.

surface, the heated ail-divides part of it passing transversely through the corrugations between the liners and out again above partition 15 and thence out through the fan. Another part of the heated air passes above. liner 4 but, owing to battle plate 17, adjustable to suit varying conditions, the air accumulates above the. double-faced corrugated board and exerts pressure thereon to prevent the air passing through the corrugations from rupturing the bond uniting the constituent elements of the double-faced board.

By this process the material is so thoroughly dried as to need no stackin and uniform adhesion of its constituent e ements is obtained. In addition, the machine can be operated at a much higher rate of speed, successful runs at one hundred and seventy feet per minute having been obtained.

In order to make the drawing as diagrammatic as possible, as much mechanisn'i as feasible has been eliminated. Thus the usual conveyors employed to carry or drag the board have been omitted from the drawing.

I claim:

1. The method of drying double-faced corrugated board on the run which consists in passing, in a direction at an angle to the corrugations, said board over a heated surface and in establishing a current of heated air through the corrugations between the liners thereof in a direction at an angle to the direction of travel of the board while subjecting the upper outer surface of said board to heated air under pressure greater than that established by the current of air passing through the corrugations.

2. The method of drying double-faced corrugated board on the run which consists in passing, in a direction at an angle to the corrugations, said board over a heating surface in a heating chamber, in passing a current of air from the exterior of said chamber into the chamber beneath the heating surface and thence transversely across the top of the heating surface through the corrugations between the liners and above the board, and in throttling the current of air passing above the board to subject the top of the board to pressure greater than that established by the current of air passing through the corrugations.

3. The method of uniting corrugated board and liners to produce a double-faced corrugated board which consists in pasting the constituent elements together, then placing the product on a support, and then establishing a current of heated air through the corrugations between the lines of the, board and subjecting the exposed outer face of the board to air pressure greater than that existing within the corrugations between the liners of the board.

4. The method of uniting corrugated board and liners to produce a double-faced corrugated board which consists in pasting the constituent elements together, then placing the product: on a support, and then sub jecting the exposed outer face of the board to air pressure and simultaneously therewith drying the product by the application of heat.

5. The method of uniting corrugated board and liners to produce a double-faced corrugated board which consists in pasting the constituent elements together, then placing the product on a support, and then subjecting the exposed outer face of the board to air pressure greater than that existing within the corrugations between the liners of the board, and simultaneously therewith drying the product by the application of heat.

6. The method of drying double-faced corrugated board on the run which consists in passing, in a direction at an angle to the corrugations, said board over a heating surface in a heating chamber and simultaneously passing a current of heated air through the corrugations between the liners and over the exposed surface of the board.

Signed at New York city, in the borough of Brooklyn, county of Kings and State of New York, this 28th day of April, 1921.

RICHARD E. JONES. 

